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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe52282ca7f0099737682e5fc7ff73de9f218b58c28e69e1e3286ac22e2836fe' 
  AND token = 'SzxnT+IEt0qxYD+fgARsQjHkDp1Q29LousDB4rJHSIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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