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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2d678419948cd6564de66b4a73829633b7f9c9e3025b5a1b5e6cee7d36c303b' 
  AND token = 'uxeCI0rNvfAe8LQc6fosYL3o2yVKQNvssjOiUSXByyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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