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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a86eb9f8eecfc64be8636f312d340f9e51ac45412a35f59503fff7caea8eda7' 
  AND token = 'F9JAtFJI2rES0OvISYIiOCj19nV1mo/lzbS/UGHzyto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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