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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'b2c1b23bd65953b0616b5b962aabb83a7f3536ce9331ae5d75c06fc4b7f7b73f' 
  AND token = 'LrNlNGn2lEs2nEZgJUKtDs6mcmXfrkHOlxetlbU/kLY=' 
  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"
    }
  }
}