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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '0935074c41acfd77658c34fff79ce1d0b3a4c9e802a40811310ed50599a40349' 
  AND token = '243/slxrUK9Uwes9FMFYZbH0ssziYPghbRsPaonX0og=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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