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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39d107079b08f9309be5b8042b59e4fd6a5ba10567cdbe408d471ad81fb60f82' 
  AND token = 'Zt2J691xCxbx5mulubhxAJq1AGFy+oMdRYjCnkxarOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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