SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '0a0ba69b49dac4b9e7e995befe646860ad7f8162a7112c1f7550a38e255bc541' 
  AND token = '7rm3bFqt/6baLUFFYZKGUU+nVousSRBXR7MG0+qicGs=' 
  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"
    }
  }
}