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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc85dc11ce9980a8c025274394613fd7395568f48716731fb7b203970396ed02' 
  AND token = 'BhyWo7s+0ZZfG5IIgYRMY5CVCMaZo7kx7AG9eGjt5ao=' 
  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"
    }
  }
}