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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fca1ae97045a311aed5fce6b115e58d8edeee8d87931199dd239879cc516c4c' 
  AND token = 'F1DCaDCT5XZ/6PM5xYoGkUZciNX4DKSN3a08mrbciwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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