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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '4c42def07af0956cb4dc07251257ff99f2c58738d84e1221dbe672de480f6950' 
  AND token = 'nYupokXiOPJdIk2N6VNnQdgsdvYNJC4Xas1YzFc64Ko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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