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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c1631264e6ce7b581d2497801c49cc16614a07025f41e2e1d3920a4e388818a' 
  AND token = 'SC/EtF5pym/yqDr+l4lolXkhVX19I0aYUN/a+dFyAW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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