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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ca15003931a245091166160a17b86adc38ba9be5f098d46959691ae05f74b64' 
  AND token = '7lSYt2JqPx/545WOHcI8PIxuEpM6bZYNeIyULqg0PL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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