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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '3b96065c93be71447f02831f986454036fb2c1efbf8c3c135e4c2f0ce87b0a52' 
  AND token = 'hwk/fhq+7D/9NiX6LLhEZ1AeJyWeJPO7MHlEOLvJi0I=' 
  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"
    }
  }
}