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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'f55fbca79967ffed09b3e66e99c37e23532bd47ab944b8473695b59e4305aec2' 
  AND token = 'cQxs8TA0wWQShNvwMI1lImO/1bo4E/anHPytTNygs4c=' 
  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"
    }
  }
}