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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '855c9e39402e94ce9014207c0b4a3ac0191e9e7aac2393fcfb4313e3a0318ed8' 
  AND token = '1pMTXOn9aIL9+4r+slUIeRYm0q3N9TwvghPw9NpJZoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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