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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'e68c39c8700ef4ae344fc8b30164b480a545a1f33cfec5657302348130c84d0f' 
  AND token = 'Pu2d4Qu0QWxaPSUHMNErgqmF+sCWBCfjGukNrBO2z5I=' 
  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"
    }
  }
}