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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '08b27780907c47dcd400fb9dd49025f33d33a6286a35383466869ec2752e5c67' 
  AND token = 'AQSlaDvDAgFVkKTRI+uiDRw6D81CLRQ7cfGFtw+jJM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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