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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'b40bffb3695fc5b43704146bc9438ced9e19bde8848cd48e1051d508ac7c7f20' 
  AND token = 'QDzpVyxH6n93u2uXoYFkz6792+0SZIAn17b7HM6EI0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00008

JSON explain

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