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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '983cf51f8704637d67a94d34fd50b753843eac83e5de1347de77b1b19266409b' 
  AND token = 'qVdx+9eo59JwbDhqL5mTCff5SZQd4iTOQ3gWw+vFRjs=' 
  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"
    }
  }
}