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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa1ce2906a3908fa0132bb461913619a55f6c7e0684c7f35d8180e50c88ee73d' 
  AND token = '/FCW0TuRlNh5d/5sCId8ObJPxrdhUtrlRokfCTuw4To=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}