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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '8a9d68309ae5dcc3343331d50ab016404e64edce6bf606f9e35f9c62533adb7c' 
  AND token = 'dXEDA0ntNeVq9le3NUrqxKr6GGdFW9agZWePNF7dmq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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