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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'ad15ca04d736e9668e4904dfdd4617c7a1def8f12ec652c06f0f101c94c7f414' 
  AND token = 'P9l7fIOjRADebcj+uDE9iE4TtM/s04i8+qHm8/E7tHw=' 
  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"
    }
  }
}