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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '7eb99e1019a22ac2da85d83877af3d24a3f29a98335e19aefbf33d8d3a6ab672' 
  AND token = 'CCt3askxBO8XEQe4vvcwe49XR0DWALz9SkyLYSMRJ1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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