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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7961ef7c09c184ad3acd40d670cdb1ac0d1fd92c4b65d87c2e07b5627d0a5932' 
  AND token = '9Pb0dS+QHusp/WoIeQoO0k4txVcOdvy6QbkhF9UXU4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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