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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40e549a63866167ad32155e5aaef9b7452458c687a634d52b65f7f4e35b8e4ca' 
  AND token = 'qiLUrMLg8rgi3GY1OkQWXP4iR4RIsWMEgBcUabSilXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00073

JSON explain

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