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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00e6684c4e105855eb1fdd1eeb012fd5efebc5ce41282ecbe714a304dba63c52' 
  AND token = 'sWo7CQS3G+AApvcIneU7n9xzZLK4n4ow45JPtDoY5v8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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