Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2516ea8baa8be27429fbd5ffcfbe09eedd721a6d43e14d66e87e31f90197a1c' 
  AND token = 'nuePNtR9Ser8KRK3KSbPt4jasNT6VG2+As0f8x4OCYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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