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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '841c93d4b65e64efc0ccf2dc1f1f33e7d2bf756f057a3258deaa23aa3145caf2' 
  AND token = '29Iw2YHv/nxuT/7iUkURNbBY3rG4z25pb6fuKSIU1NA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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