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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0752e67691434dbcdc9d1716358d2ab5483466db053aef3ed824885b9027263' 
  AND token = '2ube8vAnUKtfnAQFDjtbeXPtxzQSqJJ1KqSiSCOcm1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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