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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '7fd4edccb205a49db661b3e7d9d1fd4c0ead588f7a27486906d229fa847911cd' 
  AND token = 'utF2tast1vK+sLf4NuJRCSSsQLp/hu2+XlVpXQqtpfo=' 
  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"
    }
  }
}