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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf65f326c80c080db09530168abef9d4715cbb0b4593382448d822a4a988d445' 
  AND token = 'sbx7zfd19O9sSSgo25XW3MEtiP+cW+P5+952Rq+zlsk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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