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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64d847490f5a9c32bbf474e22fe8a9bdd35414b9d13ccc1f95e311bc538def0c' 
  AND token = 'JXBlx0BNu8GPKBcWBiM9U8Sd4qud5jfts1m+sP7MNk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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