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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44ddbf61abffd8805daf2894a18955fd792b2ed6eaf74645c291a7ad08010374' 
  AND token = 'ylOZGBduB9mLvEMyYeklL9L3fXS8gE64/CQSA2zny98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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