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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '862093c32f9285e171c2b539a914082e7d9db03a79098cf95e374afe4bf8f026' 
  AND token = '+9Rd0Rq6dSmVlavjR9RJfB6zIY0anbx/E5a4B+IV+nM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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