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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '5269a8028e94069f46c5ba04f6d65e438efcaf5fde60d1fee5c0e0731058f509' 
  AND token = 'rY9KSRUn07rehVcSnzaNuw7OOrcr+2eHXm9QHKfI54c=' 
  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"
    }
  }
}