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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '2b9a54597e1bc1634bf66a9d70b6cd6b8c6d87e95aa38f49a64d13bbbb70b78b' 
  AND token = 'FnobNjGKb/DwmY2tO8fDG87zKMBVtzLZDoXDzSb1IBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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