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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38f0f84cf2828f9d05fde7d27bb58e33f3e687071ca47843f06bf51601d0c164' 
  AND token = 'QkZhE1LpwWZ98/Ei/xOkPwn2qaEhdGb3qgb75f56tTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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