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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d8905b7b24d6b9425cd9ec0a7b44af60cc5ab61446bd342301e0fa1fca7af16' 
  AND token = 'fIIS5Lh4yhlbw1iQu7Tc5tfCFE6IFYgJWFvEch6K8g8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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