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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'dcd4d1c0eabfc2397e84cee639f9ba7a1ee5e834e9226a611354f138a3f76bbf' 
  AND token = 'wY9GHukUNbX4wuFCDzorn5pHTXW2PcXW2dLOvW0hvPg=' 
  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"
    }
  }
}