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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b0362bf8cf2ae0670f9c3ac20bf4cc7111b75bbf9dfed7261bbde03920194b3' 
  AND token = 'CVgsEjwqLkvH5RIy40DwLjImbsQZ56Ke3yHhvoXmPww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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