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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'ed8d756943ebd815f3a2d8213fa21049ed0c3faa1fcd75bd15fe3a0489390a68' 
  AND token = 'hTYCuEdjUckYkAFr5cCos/1p1FC36iNNOq3TfuPXjjQ=' 
  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"
    }
  }
}