SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10e6168cf8469bf10ba957237afa928cb3d77cd848fc24f412350fc980fff723' 
  AND token = 'CDgZugTozoBRZCZcpEU/3kLlzQOCwqK0yzmIxdZ+CoQ=' 
  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"
    }
  }
}