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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '437713729c2b05a26a9a9a410b1f30d78b42b3f29cd7a715f47d5894e545e288' 
  AND token = 'ltVC75XtaWrpqF9bGYXLURN0WGpufo41LkkZRlx0uMA=' 
  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"
    }
  }
}