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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05700501a25b36a6aeea80749ceca65aa7b7baf183a94d053b51d0ab38f420e1' 
  AND token = 'gTzjfh+pD6f25JHNC5KqhPCB+ZTaesQX4DKoM7JQeWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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