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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '677359de2cd116694022db7d139fa395d44e00613637e16eeb64306edb1b69ad' 
  AND token = 'U9JSXFtpNxbZEyjCIP2wH96SBVjdi/xO3ysYV9n7YWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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