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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5617cb8f168590cf6e37e55ca0eb9343b3887e0fa6c195b08bd6a78e0f117e38' 
  AND token = '932UZxBPVYp48WoGaQg1CSAAKKX2Dd8WlCQTJDZ0Fvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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