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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '443afbed0f98cca8af8a68476fa28ee07cf118f41b95d004e6c11716de282a31' 
  AND token = 'duGZWITf1SQNdxncOjcW2o0Rb3D81Fpzh5Buvq13gAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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