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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '59612b09badb2c951e263cca9886b3a94f89153cb3e27b69298eec8ea4c62f0d' 
  AND token = 'K91Bzyb3cXhyQ+oBySrpKo+tP3HfBQfcfuRWfxFbGqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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