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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7148e67444cdc8dbbec50e588bc09c105baf3ae11b89500357028d7367f3b20' 
  AND token = '9/e4CqYyBGiZ0ynhau6sY25q5+9VRtVz4CHh4vtAo1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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