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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'f5ea3ad1b31ced74dd690bd88364fc6fe490fc180f3e99dd021838b595f7ea7f' 
  AND token = 'Kq+DA8/5ACEIO1nei6i8isquldEDl2sJRnJhfp5jzvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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