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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59488f7659af856fdcd64a2e8fcd9fe622d484ee3ceb109461a3d9d5e9fbd0c8' 
  AND token = 'ilS0Wg9aMXkEvN9mTfyWghesV9vfUoVEkGA1Jsb7XSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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