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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '4756281f821f0818051fa8ffa0e7c2226a56cdf06f428b9350936b3dc42e1bb9' 
  AND token = 'maOUtqtMhdZQCtqPWVkdwEHNOaT6d1fcC52Ml5Yfiqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00008

JSON explain

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