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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3be01b162ba7b7b03d1b4675c0e44dac1b9cbb213c7049f996431b8f59fdfce' 
  AND token = 'IIkUSbQtbAG5pQ6S01hsoF0ZaYOsHcx7ujrE2dngf8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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