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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5528471e60d110485d7040c86ae4ea5e070e325f6593083bf70a4bf3cd95108d' 
  AND token = 'zXM/nZB83VsmT0aCOE2YZN0QHbDqNfNRLN7vHW3BXO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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