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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '5350e29fcb25c6accd24ee5984daccb65bcddb87d09587ffc05476e0438e34a3' 
  AND token = 'x2mDOGdTG6noKzHdsndC7LprHwbqERak/dwtooC+ze4=' 
  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"
    }
  }
}