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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4392850919e2e882e77659f17b1c98ef1238b776416c9ab826aa796b6847eb4' 
  AND token = '1V/BFYZML6yEMZuI8WhRa7F6RXWaX5sg200E/ZiAqpM=' 
  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"
    }
  }
}