Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9879aac2c934c3ea823df075de093022b33eb5b6f698d39b0d61c25959994e92' 
  AND token = 'PbAxVbr3xprd8VEd39D2McnGAShHl2dj5mlINj5EV3Q=' 
  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"
    }
  }
}