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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a68dbc01016bf7814e90be5a72b739858f41d70af8f94d39b951a6ebe7375c3' 
  AND token = '3ssUdjaT6OQcGsSyjkcAvWSoh3kw/yZg0eNn42nh0aA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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