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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e60830af0146327e7bd3fdfd535191e9dd785ddefb9b26d74da07d824cdc85c5' 
  AND token = 'VI0P1ap9Zm8LVDQC7zvCf3JzTA6DHawQTS9fTtt0o7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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