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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '958c71488c9a3c89ca622a6ff4c5f064a4422bd6c9f3599f5384e3439054eb1d' 
  AND token = 'kYngjFEMkF+HMcd5KdMEQF8nGMbloPjtMQvfJ5vXkzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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