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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8f41776c662f22371bb70eda500a4ba43ba7c71bf95ec1faec920ec6c01efe4' 
  AND token = '6ckKfPpwcEIvdQV2vApOb3nFMtWeSdF0/1YOU+C5d5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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