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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a243f3454e08fa1194356a0542aa9b60ff4c2852d9788b31ea0e7017c9ec4d8' 
  AND token = 'oth4vbxM4P+RA857lJqfAxrRMaDsIdB5tFX0ZaeliGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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