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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '3cc0256d08628369e84d40e96a6c0eb28367db9cda809802464485b788bfcbf6' 
  AND token = '2rkUf51mJrZJNdxbiutrERj0S6Fgc4cjbQ5RwIjZzjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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