SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '287698f9b351d60d1d7a1f9e4c93581c8e41cbdcda54722954eddc0b5f95a1d0' 
  AND token = 'g/hKjmvPAL2dtGO+VEEPaTTfoRlAHkvBlX7J2HYSVIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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