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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bde46dbae2cb4ea082650866291d5129f5cae9e30e702f42551b607624dd838' 
  AND token = 'fad85X2nwFghT7wfLHvqt6aK6fPLvSZ5s6aATmcObko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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